Oh the irony.
How many times I quoted myself on vac. leak detection, and I now have AN INTERMITTENT one.
Every so often, it lopes about 300 rpm's at idle. But not always??? When not, it's smooth as can be.
Is there a common place to start? Like plenum / runners, on L98?
Happens only in Closed Loop. Got the can of started fluid just earlier...
Quote:
Originally Posted by Schrade
Vacuum leak.
Detection process follow to a 'T':
EVERYone should bookmark this post too.
Quote:
Originally Posted by Blade_1 View Post
Idle to warm motor. MUST BE CLOSED LOOP WARM.
Brick on GAS pedal, block TB linkage, anything to get a STEADY idle - about 2k rpms. MUST BE STEADY.
Spray starting fluid everywhere air can get sucked in, A LITTLE AT A TIME, until the motor surges. That's the leak. If it's in a tight spot, light a book of matches, blow them out quickly, and feed the smoke to the draw. Don't stop when you find one leak either. Plenum-to-runners, runners-to-intake, emissions hoses (EVAP cannister, EGR) valve covers, brake booster, EVERYWHERE. Vacuum/intake leak will make a 2012 car lope idle, and also will make a 50 year old lawnmower lope idle.
Bookmark this page!!!
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This ain't hard. But I know of only 1 PERSON who ever got it right, and found his intake leak.
Even mechanics don't know how to get it right... |